/**

 * 根据parse_url格式的数组生成完整的url

 * @param array $arr 接受parse_url解析出来的所有参数,完整参数实例如下：

 *        Array

 *        (

 *            [scheme] => http            // 协议

 *            [host] => www.baidu.com     // 主机

 *            [port] => 80                // 端口，可选

 *            [path] => /path/file.php    // 路径(文件名)，可选

 *            [query] => a=aaa&b=aaabbb    // 参数(query string)，可选

 *            [fragment] => 123            // 附加部分或者叫做锚点(#后面的)，可选

 *        )

*/

function http_build_url($url_arr){

    $new_url = $url_arr['scheme'] . "://".$url_arr['host'];

    if(!empty($url_arr['port']))

        $new_url = $new_url.":".$url_arr['port'];

    $new_url = $new_url . $url_arr['path'];

    if(!empty($url_arr['query']))

        $new_url = $new_url . "?" . $url_arr['query'];

    if(!empty($url_arr['fragment']))

        $new_url = $new_url . "#" . $url_arr['fragment'];

    return $new_url;

}

$url = "http://www.dragondean.cn:80/path/file.php?a=aaa&b=bcdefg#123";

$url_arr = parse_url($url);

print_r($url_arr);

$url_new = http_build_url($url_arr);

echo $url_new;

Array

(

    [scheme] => http

    [host] => www.dragondean.cn

    [port] => 80

    [path] => /path/file.php

    [query] => a=aaa&b=bcdefg

    [fragment] => 123

)

http://www.dragondean.cn:80/path/file.php?a=aaa&b=bcdefg#123